Improved tube-hole cutter



@uitrit faire bstrnt @ffice- WILLIAM H. HENSHALL, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 67,194, dated July 30, 1 867. l

IMPROVED TUBE-HOLE GUTTER.

titte .Stimuli nient fr in tten stttrs atnrt mit making putt nf ttt stmt.'

TO ALL WHOM IT MAY CONCERN:

Be it known that I, WILLIAM H. HENSHALL, of `the city and county of Philadelphia, and State of Pennsylvania., have invented a new and improved Tube-Hole Cutter; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, making part of this specification, in which- Figure Iis a sectional elevation, i

Figure 2 a plain elevation, and

Figure 3 a. perspective view of the cutter.

Similar letters refer to similar parts in the`several views.

A is a spindle, having nt one end a centre, b, which is either formed to it or inserted into a socket in its end, the other end being formed for setting in the spindle of a drill-press. -B is a. left-hand screw cut for a proportionate distance on the spindle. C is a feed-wheel threaded to rit the screw B. D is a hollow cylindrical cutter with two internal diameters, thelesser one fitting snugly the spindle A. It has radial teeth cut round its circumference, as shown fig. 3. and is secured to the spindle by the gib and cutter c d set in the key-ways' e and the slotf in the spindle, in such manner that while the cutter rotates with the spindle it is permitted to raise'and lower on'it by the gib and cutter sliding vfreely in the slotf` which is made of a length corresponding to the thickness of the washer the cutter is required to cut-out. E is a spiral spring contained in the greater recess of the cutter encircling the spirnlle,-. its ends being enclosed between the top of the recess and the iixed collarg on the end of the spindle. An adjusting-ring, F, is slipped over the cutter D, and is held in place by set-screws h z', one of which holds in place the coun'tersink-tool G, which is contained in an opening formed in the ring, by pressing it firmly against the'surface ofthe cutter, -.ts inner surface being rounded to correspond with that of the cutter. y

My improved tool is for cutting out the tube-holes in the tube-sheets of boilers. To do this it is not requisite that a. hole should bc previously made in the sheet, aswith other borers or cutters. It is simply necessary to lay oil' the centres ofl the holes, which are afterwards centre-punch markel, and adjust the ring F atv a distance above the teeth of the cutter about equal to the thickness ofthe sheet. The spindle A is inserted into the spindle of a. drill-press, and the tube-sheet fixed'on the table of the sume, and adjusted that either of the centre-punch marks may be directly beneath the centre b. The spindle ot' the press is then screwed down until the centre-takes into it. On starting the press, the operator holds the feed-wheel C from turning, The screw B being left-handed, causes it to screw down, forcing the teeth of the' cutter D into the work. As the cutter revolves and feeds it compresses the spring E until it has cut a channel or ring through the plate, removing a circular piece or washer, which sticks to it. The feed-wheel()1 is reversed, removing its pressure from the cutter, at which instant the spring E opens and lifts the cutter from the sheet and forces the washer from The tool G can be made to count-ersink the sheet at the same operation, if it is to be on the side drilled from. After thevplate or washer has been removed, burrs or ragged edges often remain on the under sideof the sheet. They are removed by filing.

I do not confine myself to a left-hand 'screw on the spindle, but will use either right or left, as the case may require. l

What I claim as -my invention, and desire to secure by Letters Patent, is

1. The improved tool as a whole, constructed and arranged as herein shown and described.

2. The combination of the cutter D, adjusting collar F, and the countersinli-tool G, constructed and arranged as shown and described.

3. The combination of the threaded spindle A, feed-wheeler nut C, spiral spring E, collarg, and the cutter D, constructed and arranged as shown and described.

In testimony whereof I hereunto sign my name to this specification in presence of two subscribing witnesses.

WILLIAM H. HENSHALL.

Witnesses:

FRANcIs D. PAsToRIUs, W. W. DOUGHEMY. 

